Oops. I was multiplying 512 bits times 5000 bits per second. I guess I lost
a digit. Sorry.
Now it's a much more interesting problem!
Priscilla
At 06:22 PM 10/10/00, Brian wrote:
>On Tue, 10 Oct 2000, Priscilla Oppenheimer wrote:
>
> > At 12:01 PM 10/10/00, Arun Upadhyay wrote:
> > >Can anybody please help in solving this problem?
> > >
> > >A router is connected to a T1 line which has the
> > >maximum speed of 1.544mbps. The router begins to
> > >forward 64bkps packet at 5000 packets per second,
> >
> > Do you mean 64-byte packets? If you convert that to bits it's 512 bits.
> > 5000 packets of that size per second is 560,000 bits per second, which
> is a
> > lot less than 1.544 Mbps so not much buffereing will be needed at all. You
> > could have just one buffer and no packets should ever get dropped.
>
>Priscilla,
>
>How did you come up with 560,000 bits per second? Can you break that down
>for me, I know I must be doing something wrong:
>
>64bytes * 8 = 512 bits
>512 bits * 5000 packets = 2560000 bits
>
>brian
>
>
>
>
> >
> > >there are 500 buffers available.
> >
> > How big are the buffers? Can we assume they are 64 bytes also?
> >
> >
> > >Approximately how
> > >long before the link is complelety saturated, the
> > >buffers are full and the router begins to discard.
> >
> > If you are trying to get help with questions like this that appear on the
> > CCIE written test and practice exams, you will want to give us an example
> > of where the WAN link is oversubscribed. For example, if the offered load
> > to the WAN link is 110% more than the WAN link could handle, 500 buffers
> > would get used up in about 5000 packet times. (I think? Comments anyone?)
> >
> > In reality, packets don't arrive at a constant rate, so much more
> difficult
> > math and queuing theory is required, and that goes beyond the research and
> > thinking I'm willing to do right now. &;-)
> >
> > Priscilla
> >
> >
> >
> > > Thanks.
> > >
> > > Arun
> > >
> > >=====
> > >Arun Upadhyay
> > >SE Engineering
> > >MCSE CCNA CNA
> > >
> > >__________________________________________________
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> > Priscilla Oppenheimer
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>-----------------------------------------------
>Brian Feeny, CCNP, CCDP [EMAIL PROTECTED]
>Network Administrator
>ShreveNet Inc. (ASN 11881)
________________________
Priscilla Oppenheimer
http://www.priscilla.com
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